diff --git a/tests/core/test_history.py b/tests/core/test_history.py
index dd6243d8746e1d70cff735473dd4bedd3b2464a0..c7e67cd43cb8152e40be3f9f854d84f77f52878a 100644
--- a/tests/core/test_history.py
+++ b/tests/core/test_history.py
@@ -253,6 +253,7 @@ def test_append_force(__hist, s, max_val):
 )
 def test_aggregations(__hist, col, expected, hist=History(index=pd.Index(range(6)))):
     import saqc.core.history
+
     hist.append(col)
     check_invariants(hist)
     for aggregation in ["last", "min", "max"]: